The secondary level of protein structure involves
A. folding of the primary structure upon itself.
B. the number of peptide bonds in a polypeptide chain.
C. substitutions in the amino acid sequence.
D. interactions with other polypeptide chains.
E. none of these.
A
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An organism at the top of the food chain:
A. has no natural prey B. has no, or very few, natural predators C. experiences no selection pressures D. is not subject to evolutionary changes
When erythrocytes are old or die, how are they removed from the blood stream?
a. the liver filters them out b. they break up into small particles and are cleared out by the kidneys. c. they dissolve into liquid and circulate in that form in the blood d. they are attacked by macrophages and removed e. they stay as intact dead cells and are filtered out by the kidneys
All food chains begin with a photosynthetic producer.
Answer the following statement true (T) or false (F)
Nondisjunction of the X chromosomes may occur during formation of gametes and produce two kinds of eggs. If normal sperm fertilizes these two kinds of eggs, which of the following pairs of genotypes are possible?
A) XX and XY B) XYY and YO C) XXY and XO D) XYY and XO